Adjustable air/gas shutter valve

Abstract

An air to gas mixing valve is provided for fireplaces especially those having sealed combustion chambers as employed in direct vent fireplaces. The novel mixing valve comprises a channel shaped shutter which mounts on and is linearly slidable over a window or windows made a part of the gas mixing pipe which connects to the fireplace burner. An adjustment rod is rotatably coupled to an actuating arm on the channel shaped shutter and extends through at least one sealed panel and has a rotatable nut or screw for linearly moving the shutters over the windows from a remote position.

What is claimed is: 
     
       1. An air/gas valve for controlling the air to gas mixture supplied to a gas burner inside of a fireplace, said valve comprising: gas pipe means for connection to a source of gaseous fuels,   gas jet means mounted on said gas pipe means,   gas mixture pipe means for connection to a gas burner,   window means in said gas mixture pipe means juxtaposed said gas jet means,   shutter means operably movable over said window means for opening and closing said window means from a point remove from said window means,   said shutter means comprising a guide plate extending from a channel shaped member and being provided with a guide aperture for slidably guiding or said gas jet means, and   adjustment rod means coupled to said shutter means and extending to an accessible point on said fireplace for opening and closing said shutter means remote from said air/gas valve.   
     
     
       2. An air/gas valve as set forth in claim 1 wherein said shutter means comprises a channel shape member having at least one shutter movable over a window means. 
     
     
       3. An air/gas valve as set forth in claim 2 wherein said shutter means comprises a pair of shutters movable over a pair of windows in said gas pipe means. 
     
     
       4. An air/gas valve as set forth in claim 3 wherein said pair of shutters are spring biased toward each other and slidably engage said window means. 
     
     
       5. An air/gas valve as set forth in claim 3 wherein said pair of shutters are spring biased toward each other and only one of said shutters is slidably engagable with a window of said window means. 
     
     
       6. An air/gas valve as set forth in claim 2 wherein said window means comprise a pair of windows and said shutter means comprise a pair of linear slidable shutters cooperating with said window means. 
     
     
       7. An air/gas valve as set forth in claim 1 wherein said shutter means is linearly slidable in an axis other than orthorgonal to the axis of said gas mixture pipe for opening or closing said window means machined onto an end of said gas mixture pipe. 
     
     
       8. An air/gas valve as set forth in claim 1 which is mounted in an air space below a combustion chamber of a fireplace. 
     
     
       9. An air/gas valve as set forth in claim 8 wherein said adjustment rod means and said gas pipe means extend through panels forming said air space. 
     
     
       10. An air/gas valve as set forth in claim 9 which further includes means for sealing said apertures in said air space. 
     
     
       11. An air/gas value for controlling the air to gas mixture supplied to a gas burner inside of a fireplace, said valve comprising: gas pipe means for connection to a source of gaseous fuels,   gas jet means mounted on said gas pipe means,   gas mixture pipe means for connection to a gas burner,   window means in said gas mixture pipe means juxtaposed said gas jet means,   shutter means operably movable over said window means for opening and closing said window means from a point remove from said window means,   said shutter means being slidable in an axial direction orthogonal to the axis of said gas mixture pipe,   said shutter means having edges which slidably engage edge portions of said window and are guided thereby, and   adjustment rod means coupled to said shutter means and extending to an accessible point on said fireplace for opening and closing said shutter means remote from said air/gas valve.